# Copyright (c) 2015 The Mirah project authors. All Rights Reserved.
# All contributing project authors may be found in the NOTICE file.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

package org.mirah.builtins
import org.mirah.macros.anno.ExtensionsRegistration

$ExtensionsRegistration[['java.util.concurrent.locks.Lock']]
class LockExtensions
  #
  # Obtain the lock for the provided block, unlocking after executing the block
  # For example
  #
  #    lock.synchronize {
  #      # do critical thing
  #    }
  macro def synchronize(critical_section: Block)
    # TODO if block has args, blow up
    quote do
      `@call.target`.lock
      begin
        `critical_section.body`
      ensure
        `@call.target`.unlock
      end
    end
  end
end
